Sounds like something's wrong with the brake booster or the hose to it
Get that fixed and you should get at least a couple of pumps of the brakes with the motor off
I used to use one long, light braking action when I was driving the Black Widow, and very rarely did I run out of brakes. Once or twice I had to key it back on, but not once did it cause any kind of emergency stop.
You can also use the e-brake for assist if you have a handle, not a pedal.
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